For 1.0.35

INSTALL/grub/debug.cfg

@@ -175,6 +175,15 @@ submenu 'Check plugin json configuration (ventoy.json)' --class=debug_json {
         unset pager
     }
     
+    menuentry 'Check custom boot plugin configuration' --class=debug_custom_boot {
+        set pager=1
+        vt_check_plugin_json $vt_plugin_path custom_boot $vtoy_iso_part
+        
+        echo -e "\npress ENTER to exit ..."
+        read vtInputKey
+        unset pager
+    }
+    
     menuentry 'Return to previous menu [Esc]' --class=vtoyret VTOY_RET {
         echo 'Return ...'
     }